# Conversion! vs Inches and Millimeters

The clearest difference is price: Conversion! at Free against Inches and Millimeters's $0.99. Inches and Millimeters's advantage is iOS requirement (13.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Conversion! is free to download; Inches and Millimeters costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Conversion! ships an update every 20 months, Inches and Millimeters every 11 months. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Conversion! | Inches and Millimeters |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 11 months** |
| Size | 15 MB | 1 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [Le Vu](https://appshunter.io/developer/888757091) |

## What reviewers say

### Conversion!

[App page](https://appshunter.io/ios/app/conversion/id1227201297)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Inches and Millimeters

[App page](https://appshunter.io/ios/app/inches-and-millimeters/id6473122116)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Conversion! free?

Conversion! is free to download, with no in-app purchases.

### Is Inches and Millimeters free?

Inches and Millimeters costs $0.99, with no in-app purchases.

### Do Conversion! or Inches and Millimeters have ads?

Neither Conversion! nor Inches and Millimeters shows ads.

### Which is updated more often, Conversion! or Inches and Millimeters?

Conversion! ships an update every 20 months, and Inches and Millimeters every 11 months. Most recently, Conversion! was updated on October 7, 2026 and Inches and Millimeters on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*